Question

How to copy a string in Go

Answer 1

// Copy using simple assignment

package main

import "fmt"

func main() {
    src := "Programming is fun"
    dest := src // Same reference

    fmt.Println(dest)
}


/*
run:

Programming is fun

*/

 

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Answer 2

// Copy using slicing

package main

import "fmt"

func main() {
    src := "Programming is fun"
    dest := src[:]

    fmt.Println(dest)
}



/*
run:

Programming is fun

*/

 

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Answer 3

// Copy using fmt.Sprintf

package main

import "fmt"

func main() {
    src := "Programming is fun"
    dest := fmt.Sprintf("%s", src)

    fmt.Println(dest)
}



/*
run:

Programming is fun

*/

 

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Answer 4

// Copy using strings.Builder

package main

import (
    "fmt"
    "strings"
)

func main() {
    src := "Programming is fun"
    var builder strings.Builder

    builder.WriteString(src)
    dest := builder.String()

    fmt.Println(dest)
}



/*
run:

Programming is fun

*/

 

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Answer 5

// Copy using byte slice conversion

package main

import "fmt"

func main() {
    src := "Programming is fun"
    bytes := []byte(src)
    dest := string(bytes)

    fmt.Println(dest)
}



/*
run:

Programming is fun

*/

 

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Answer 6

// Copy using rune slice conversion

package main

import "fmt"

func main() {
    src := "Programming is fun"
    runes := []rune(src)
    dest := string(runes)

    fmt.Println(dest)
}



/*
run:

Programming is fun

*/

 

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Answer 7

// Copy using manual loop

package main

import "fmt"

func main() {
    src := "Programming is fun"
    destRunes := make([]rune, 0, len(src))

    for _, r := range src {
        destRunes = append(destRunes, r)
    }

    dest := string(destRunes)
    fmt.Println(dest)
}



/*
run:

Programming is fun

*/

 

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